Update the SPI documentation to cover a few points that have proven to be confusing or unclear; most notably the two clock mode bits. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>  | 
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